Impacts

Make lakes/rivers unusable for popular recreational activities

Some harmful, non-native
species, particularly plants like hydrilla and water hyacinth are so detrimental that they completely
cover the waters they invade. Waters become so choked with these non-native plants that it is
practically impossible to get a boat through and there is no open water left for swimmers to enjoy.
Other nuisance species such as zebra mussels leave sharp-edged shells along swimming
beaches that can be a hazard to unprotected feet.